FILTER GP-FUEL 4387763 - Caterpillar

Illustration 1 g01966493
RS-485 network
This diagnostic code is recorded if the VIMSTM 3G Main ECM has detected an abnormal update rate from the RS-485 data link communication.System Response:This failure results in events that are logged against the VIMS 3G Main ECM that cannot be explained. The VIMS 3G Main ECM cannot communicate correctly with the RS-485 data link.Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS
Verify that the following part numbers are correct:
VIMS 3G Main ECM
VIMS 3G Main ECM softwareNote: Consult the business unit that produces the product for the correct part numbers.Expected Result:All part numbers are correct. Results:
OK - All part numbers are correct. Proceed to Test Step 2.
NOT OK - All part numbers are not correct. The installed VIMS 3G Main ECM has the wrong part number or the incorrect configuration software is installed.Repair: Replace the incorrect ECM with a correct ECM. See Testing and Adjusting, " Electronic Control Module (ECM) - Replace". Flash the correct configuration software. See Testing and Adjusting, " Electronic Control Module (ECM) - Flash Program".STOPTest Step 2. CHECK THE HARNESS
Turn off the key start switch.
Turn off the battery disconnect switch.
Disconnect the code-related ECMs.
Thoroughly inspect the ECM connector and the attachment connector. See Testing and Adjusting, " Electrical Connector Inspect".
Check the wiring for abrasion, kinks, and pinch points. Expected Result:The harness is good. Results:
OK - The harness is good. Proceed to Test Step 4.
NOT OK - The harness is deficient. Repair: Repair or replace the harness. STOPTest Step 3. CHECK THE 120 Ω TERMINATING RESISTORSThe disconnect switch remains off.The ECMs remain disconnected.
At the harness for the VIMS 3G Main ECM, measure the resistance between the following connector contacts:
Contact 4 (939-WH(White)) and Contact 5 (940-BU(Blue))
Contact 17 (920-BR(Brown)) and Contact 18 (921-YL(Yellow))Expected Result: